Multi-mode lens compatible with optical chips with thicknesses of 150 microns and 200 microns and multi-mode optical module

Abstract

The utility model relates to a multimode lens compatible with optical chips with the thickness of 150 microns and 200 microns, which comprises a base body made of PEI plastic, an air cavity with the lower end located in a parallel optical path is formed in the top of the base body, and the wall face, close to the optical fiber side of the base body, of the air cavity is a total reflection face inclined by 45 degrees. A first lens array and a second lens array are sequentially arranged on the chip side of the base body in the direction away from the optical fiber side of the base body, the first lens array is coupled with the total reflection surface, and the second lens array deviates downwards by 50 microns compared with the first lens array; and a glass sheet which has the same refractive index as the substrate and is used for totally reflecting light to the second lens array after the light penetrates through the total reflection surface is attached or not attached to the total reflection surface. The multi-mode lens has the beneficial effects that the multi-mode lens can be adaptive to an optical chip with the thickness of 200 microns and also can be adaptive to an optical chip with the thickness of 150 microns, so that only one set of mold is required to be opened to produce one lens, the mold opening cost is effectively reduced, and the unit price of the lens is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of optical modules, and in particular to a multi-mode lens and a multi-mode optical module compatible with optical chips with a thickness of 150 μm and 200 μm. Background Art

[0002] Most of the early low-speed multi-mode optical chips (Vcse l and PD) were 150μm thick. Currently, the mainstream thickness of high-speed multi-mode optical chips (Vcse l and PD) is 200μm, and only a few manufacturers use 150μm. In order to use optical chips with thicknesses of 200μm and 150μm, the current solution is to open two sets of molds and produce two types of lenses. Opening two sets of molds and producing two types of lenses will incur expensive costs. When the quantity of each lens decreases, the unit price of the lens will be high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a multi-mode lens and a multi-mode optical module compatible with optical chips with thicknesses of 150 μm and 200 μm, so as to overcome the deficiencies in the above-mentioned prior art.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a multimode lens compatible with optical chips with a thickness of 150 μm and 200 μm, comprising: a substrate made of PE I plastic, an air cavity with a lower end in a parallel optical path opened on the top of the substrate, a wall of the air cavity close to the optical fiber side of the substrate being a total reflection surface inclined at 45°, a first lens array and a second lens array being sequentially arranged on the substrate chip side in a direction away from the optical fiber side thereof, the first lens array being coupled to the total reflection surface, and the second lens array being offset downward by 50 μm compared with the first lens array; a glass sheet having the same refractive index as the substrate and being attached or not attached to the total reflection surface and being used to allow the light to be totally reflected toward the second lens array after the light passes through the total reflection surface.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the glass sheet is bonded to the total reflection surface by using light-transmitting glue.

[0007] Furthermore, the refractive index of the PE I plastic is 1.64, and the refractive index of the glass sheet is 1.64.

[0008] Based on the above technical solution, the utility model also provides a multi-mode optical module, including a multi-mode lens, no glass sheet is attached to the total reflection surface of the multi-mode lens, the multi-mode lens is fixed on a PCB board, a 200 μm thick optical chip is arranged in the multi-mode lens coverage area on the PCB board, the optical chip is coupled to the first lens array, and an optical fiber coupled to the total reflection surface is arranged on the optical fiber side of the multi-mode lens.

[0009] Based on the above technical solution, the utility model also provides a multi-mode optical module, including a multi-mode lens, a glass sheet is attached to the total reflection surface of the multi-mode lens, the multi-mode lens is fixed on a PCB board, a 150μm thick optical chip is arranged in the multi-mode lens coverage area on the PCB board, the optical chip is coupled to the second lens array, and an optical fiber coupled to the total reflection surface is arranged on the optical fiber side of the multi-mode lens.

[0010] The beneficial effects of the utility model are:

[0011] If the total reflection surface of the air cavity is not attached with a glass sheet, and the air cavity is filled with air, the first lens array of the multimode lens is coupled to the optical chip with a thickness of 200 μm, and the second lens array is not coupled. When light is incident on the total reflection surface, since the refractive index of PE I plastic is 1.6-1.65, in the PE I material: si n45°×(1.6-1.65)=1.13-1.17, the refractive index of air is 1, in the air: si n90°×1=1, and 1.13-1.17>1, total reflection can occur when the air cavity is filled with air, so the light can be reflected to the first lens array through the total reflection surface, and thus coupled into the optical chip with a thickness of 200 μm;

[0012] If a glass sheet is attached to the total reflection surface of the air cavity, the second lens array of the multimode lens is coupled to the 150μm thick optical chip, while the first lens array is not coupled; when light is incident on the total reflection surface, since the refractive index of the glass sheet is the same as that of the substrate, that is, 1.6-1.65, and si n45°×(1.6-1.65)>si n90°×1, the glass sheet will destroy the total reflection of the total reflection surface, but allow the light to pass through the total reflection surface and be incident on the glass sheet, and then transmit from the left side of the glass sheet to the right side, and finally total reflection occurs on the right side of the glass sheet to reflect the light to the second lens array, thereby coupling into the 150μm thick optical chip;

[0013] By whether or not a glass sheet with the same refractive index as the substrate is attached to the total reflection surface, the multi-mode lens can be adapted to both optical chips with a thickness of 200 μm and optical chips with a thickness of 150 μm, that is, it can be compatible with optical chips of two thicknesses. Therefore, only one set of molds is needed to produce one lens, which effectively reduces the mold opening cost and the unit price of the lens. The positions of the optical chip and the electrical chip can remain unchanged, and the multi-mode lens only needs to be moved a small distance along the parallel light path direction, where the distance is the horizontal spacing value between the first lens array and the second lens array. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a multi-mode lens without a glass sheet attached to the total reflection surface of the utility model;

[0015] Figure 2This is a structural diagram of a multi-mode lens with a glass sheet attached to the total reflection surface in the utility model;

[0016] Figure 3 This is a structural diagram of a multi-mode optical module using a 200μm thick optical chip in the present invention;

[0017] Figure 4 This is a structural diagram of a multi-mode optical module using an optical chip with a thickness of 150 μm in the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Multimode lens, 110. Base, 111. Air cavity, 1111. Total reflection surface, 120. First lens array, 130. Second lens array, 140. Glass sheet, 2. PCB board, 3. Optical chip, 4. Optical fiber, 5. Electrical chip. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] Example 1

[0022] like Figure 1 , Figure 2 As shown, a multimode lens compatible with optical chips with a thickness of 150 μm and 200 μm, comprising: a substrate 110, the substrate 110 is made of PEI plastic, in the prior art, the refractive index of PEI plastic is 1.6-1.65, an air cavity 111 is provided at the top of the substrate 110, the lower end of which is in a parallel optical path, the wall surface of the air cavity 111 close to the optical fiber side of the substrate 110 is a total reflection surface 1111 inclined at 45°, a first lens array 120 and a second lens array 130 are sequentially arranged on the chip side of the substrate 110 in a direction away from the optical fiber side thereof, the first lens array 120 and the ... The mirror array 120 is located directly below the reflection point of the total reflection surface 1111, and the first lens array 120 is coupled to the total reflection surface 1111, while the second lens array 130 is not in the downward projection of the total reflection surface 1111. The position of the second lens array 130 determines the thickness of the glass sheet 140 to be attached later. The second lens array 130 is offset downward by 50 μm compared to the first lens array 120, so the first lens array 120 is used to couple the optical chip 3 with a thickness of 200 μm, and the second lens array 130 is used to couple the optical chip 3 with a thickness of 150 μm.

[0023] A glass sheet 140 having the same refractive index as the substrate 110 is attached or not attached to the total reflection surface 1111 and is used to totally reflect the light toward the second lens array 130 after the light passes through the total reflection surface 1111;

[0024] In order to make the multi-mode lens 1 adapt to the optical chip 3 with a thickness of 200 μm and the optical chip 3 with a thickness of 150 μm, there are two situations as to whether the total reflection surface 1111 of the air cavity 111 is attached to the glass sheet 140:

[0025] 1) If the total reflection surface 1111 of the air cavity 111 is not attached with the glass sheet 140, and the air cavity 111 is filled with air, the first lens array 120 of the multimode lens 1 is coupled to the optical chip 3 with a thickness of 200 μm, and the second lens array 130 is not coupled. When light is incident on the total reflection surface 1111, since the refractive index of the PE I plastic is 1.6-1.65, in the PE I material: si n45°×(1.6-1.65)=1.13-1.17, the refractive index of air is 1, in the air: si n90°×1=1, and 1.13-1.17>1, total reflection can occur when the air cavity 111 is filled with air, so the light can be reflected to the first lens array 120 through the total reflection surface 1111, and thus coupled into the optical chip 3 with a thickness of 200 μm;

[0026] 2) If the total reflection surface 1111 of the air cavity 111 is attached to the glass sheet 140, the second lens array 130 of the multimode lens 1 is coupled to the 150μm thick optical chip 3, and the first lens array 120 is not coupled; when light is incident on the total reflection surface 1111, since the refractive index of the glass sheet 140 is the same as that of the substrate 110, that is, 1.6-1.65, and si n45°×(1.6-1.65)>si n90°×1, the glass sheet 140 will destroy the total reflection of the total reflection surface 1111, and allow the light to pass through the total reflection surface 1111 and be incident on the glass sheet 140, and then be transmitted from the left side of the glass sheet 140 to the right side, and finally total reflection occurs on the right side of the glass sheet 140 to reflect the light to the second lens array 130, thereby coupling into the 150μm thick optical chip 3;

[0027] By whether or not to attach a glass sheet 140 having the same refractive index as the substrate 110 to the total reflection surface 1111, the multi-mode lens 1 can be adapted to both optical chips with a thickness of 200 μm and optical chips with a thickness of 150 μm, that is, it can be compatible with optical chips of two thicknesses. Therefore, only one set of molds is needed to produce one lens, which effectively reduces the mold opening cost and the unit price of the lens. The positions of the optical chip and the electrical chip can remain unchanged, and the multi-mode lens only needs to be moved a small distance along the parallel light path direction, where the distance is the horizontal spacing value between the first lens array 120 and the second lens array 130.

[0028] Example 2

[0029] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0030] The glass sheet 140 is bonded to the total reflection surface 1111 by using light-transmitting glue, which does not affect the light incident on the glass sheet 140 and can also ensure that the glass sheet 140 is stably fixed.

[0031] In addition, the refractive index of the PE I plastic is preferably 1.64, and the refractive index of the glass sheet 140 is preferably 1.64.

[0032] Example 3

[0033] like Figure 3 As shown, a multimode optical module includes a multimode lens 1 as described in Example 1 or 2, the total reflection surface 1111 of the multimode lens 1 is not attached with a glass sheet 140, the multimode lens 1 is fixed on a PCB board 2, an electrical chip 5 and a 200μm thick optical chip 3 are arranged on the PCB board 2 in the coverage area of ​​the multimode lens 1, the optical chip 3 is coupled to the first lens array 120, the electrical chip 5 and the optical chip 3 are gold-wire bonded, an optical fiber 4 coupled to the total reflection surface 1111 is arranged on the optical fiber side of the multimode lens 1, the incoming light through the optical fiber 4 is incident on the total reflection surface 1111, the light is reflected toward the first lens array 120 through the total reflection surface 1111, and is coupled into the 200μm thick optical chip 3.

[0034] Example 4

[0035] like Figure 4 As shown, a multimode optical module comprises a multimode lens 1 as described in Example 1 or 2, a glass sheet 140 is attached to the total reflection surface 1111 of the multimode lens 1, the multimode lens is fixed on a PCB board 2, an electrical chip 5 and a 150μm thick optical chip 3 are arranged on the PCB board 2 in the coverage area of ​​the multimode lens 1, the optical chip 3 is coupled to the second lens array 130, the electrical chip 5 is gold-wire bonded to the optical chip 3, an optical fiber 4 coupled to the total reflection surface 1111 is arranged on the optical fiber side of the multimode lens 1, the incoming light through the optical fiber 4 is incident on the total reflection surface 1111, and then passes through the total reflection surface 1111 to be incident on the glass sheet 140, and then is transmitted from the left side of the glass sheet 140 to the right side, and finally total emission occurs on the right side of the glass sheet 140 to reflect the light toward the second lens array 130, thereby coupling into the 150μm thick optical chip 3.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multimode lens compatible with 150μm and 200μm thick optical chips, characterized in that: include: A substrate (110) is made of PEI plastic. An air cavity (111) is provided on the top of the substrate (110) and its lower end is in a parallel optical path. The wall surface of the air cavity (111) close to the optical fiber side of the substrate (110) is a total reflection surface (1111) inclined at 45 degrees. A first lens array (120) and a second lens array (130) are sequentially arranged on the chip side of the substrate (110) in a direction away from the optical fiber side thereof. The first lens array (120) is coupled with the total reflection surface (1111), and the second lens array (130) is offset downward by 50 μm compared with the first lens array (120). A glass sheet (140) having the same refractive index as the substrate (110) and used for totally reflecting light toward the second lens array (130) after the light passes through the total reflection surface (1111) is attached or not attached to the total reflection surface (1111).

2. A multimode lens compatible with optical chips of 150 μm and 200 μm thickness according to claim 1, characterized in that: The glass sheet (140) is bonded to the total reflection surface (1111) using light-transmitting glue.

3. The multi-mode lens compatible with optical chips with thicknesses of 150 μm and 200 μm according to claim 1, characterized in that: The refractive index of the PEI plastic is 1.64, and the refractive index of the glass sheet (140) is 1.

64.

4. A multimode optical module, characterized in that: The invention comprises a multimode lens (1) as claimed in any one of claims 1 to 3, wherein no glass sheet (140) is attached to the total reflection surface (1111) of the multimode lens (1), the multimode lens (1) is fixed on a PCB board (2), an electric chip (5) and an optical chip (3) with a thickness of 200 μm are arranged on the PCB board (2) in the area covered by the multimode lens (1), the optical chip (3) is coupled to a first lens array (120), the electric chip (5) and the optical chip (3) are gold-wire bonded, and an optical fiber (4) coupled to the total reflection surface (1111) is arranged on the optical fiber side of the multimode lens (1).

5. A multimode optical module, characterized in that: The invention comprises a multimode lens (1) as claimed in any one of claims 1 to 3, wherein a glass sheet (140) is attached to the total reflection surface (1111) of the multimode lens (1), the multimode lens is fixed on a PCB board (2), an electric chip (5) and an optical chip (3) with a thickness of 150 μm are arranged on the PCB board (2) in the area covered by the multimode lens (1), the optical chip (3) is coupled to a second lens array (130), the electric chip (5) and the optical chip (3) are gold-wire bonded, and an optical fiber (4) coupled to the total reflection surface (1111) is arranged on the optical fiber side of the multimode lens (1).

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